背景信标检测有时失败
background beacon detection failing some times
在后台使用 altbeacon 库，它仅在某些时候检测到信标，或者至少仅在某些时候将应用程序触发到前台。
以下是未检测到和检测良好时的日志。
04-20 17:10:07.335 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{422554f0: android.os.BinderProxy@42255480}
04-20 17:10:07.365 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{42256498: android.os.BinderProxy@42256428}
04-20 17:10:07.925 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ starting a new scan cycle
04-20 17:10:07.925 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ starting a new bluetooth le scan
04-20 17:10:07.925 24817-24817/com.mobinteg.ibeacon D/BluetoothAdapter﹕ startLeScan(): null
04-20 17:10:07.945 24817-24833/com.mobinteg.ibeacon D/BluetoothAdapter﹕ onClientRegistered() - status=0 clientIf=5
04-20 17:10:07.955 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Waiting to stop scan cycle for another 1100 milliseconds
04-20 17:10:07.965 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{42256498: android.os.BinderProxy@42256428}
04-20 17:10:07.985 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{422577d0: android.os.BinderProxy@42257760}
04-20 17:10:07.985 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Scan started
04-20 17:10:08.765 24817-24832/com.mobinteg.ibeacon D/BluetoothAdapter﹕ onScanResult() - Device=D6:06:36:3A:71:B3 RSSI=-63
04-20 17:10:08.765 24817-24832/com.mobinteg.ibeacon D/CycledLeScannerForJellyBeanMr2﹕ got record
04-20 17:10:08.765 24817-25200/com.mobinteg.ibeacon D/BeaconParser﹕ This is not a matching Beacon advertisement. (Was expecting be ac. The bytes I see are: 0201041bff4c000215ebefd08370a247c89837e7b5634df52400010001cb5f00000000000000000000000000000000000000000000000000000000000000
04-20 17:10:08.765 24817-25200/com.mobinteg.ibeacon D/BeaconParser﹕ This is a recognized beacon advertisement -- 02 15 seen
04-20 17:10:08.765 24817-25200/com.mobinteg.ibeacon D/BeaconService﹕ beacon detected multiple times in scan cycle : id1: ebefd083-70a2-47c8-9837-e7b5634df524 id2: 1 id3: 1
04-20 17:10:08.765 24817-25200/com.mobinteg.ibeacon D/BeaconService﹕ beacon detected : id1: ebefd083-70a2-47c8-9837-e7b5634df524 id2: 1 id3: 1
04-20 17:10:08.775 24817-25200/com.mobinteg.ibeacon D/BeaconService﹕ looking for ranging region matches for this beacon
04-20 17:10:08.985 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Waiting to stop scan cycle for another 71 milliseconds
04-20 17:10:08.985 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{422577d0: android.os.BinderProxy@42257760}
04-20 17:10:08.995 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{4225b930: android.os.BinderProxy@4225b8c0}
04-20 17:10:09.065 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Done with scan cycle
04-20 17:10:09.065 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ stopping bluetooth le scan
04-20 17:10:09.075 24817-24817/com.mobinteg.ibeacon D/BluetoothAdapter﹕ stopLeScan()
04-20 17:10:09.085 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Normalizing between scan period from 15000 to 14915
04-20 17:10:09.085 24817-24817/com.mobinteg.ibeacon D/CycledLeScannerForJellyBeanMr2﹕ Waiting to start next bluetooth scan for another 14915 milliseconds
当它发射良好时，它显示为：
04-20 17:10:56.225 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ starting a new scan cycle
04-20 17:10:56.225 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ starting a new bluetooth le scan
04-20 17:10:56.225 24817-24817/com.mobinteg.ibeacon D/BluetoothAdapter﹕ startLeScan(): null
04-20 17:10:56.235 24817-24833/com.mobinteg.ibeacon D/BluetoothAdapter﹕ onClientRegistered() - status=0 clientIf=5
04-20 17:10:56.245 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Waiting to stop scan cycle for another 1100 milliseconds
04-20 17:10:56.245 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{422922d0: android.os.BinderProxy@42292260}
04-20 17:10:56.285 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{42293608: android.os.BinderProxy@42293598}
04-20 17:10:56.285 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Scan started
04-20 17:10:56.995 24817-24832/com.mobinteg.ibeacon D/BluetoothAdapter﹕ onScanResult() - Device=D6:06:36:3A:71:B3 RSSI=-68
04-20 17:10:56.995 24817-24832/com.mobinteg.ibeacon D/CycledLeScannerForJellyBeanMr2﹕ got record
04-20 17:10:56.995 24817-24865/com.mobinteg.ibeacon D/BeaconParser﹕ This is not a matching Beacon advertisement. (Was expecting be ac. The bytes I see are: 0201041bff4c000215ebefd08370a247c89837e7b5634df52400010001cb6100000000000000000000000000000000000000000000000000000000000000
04-20 17:10:57.005 24817-24865/com.mobinteg.ibeacon D/BeaconParser﹕ This is a recognized beacon advertisement -- 02 15 seen
04-20 17:10:57.005 24817-24865/com.mobinteg.ibeacon D/BeaconService﹕ beacon detected multiple times in scan cycle : id1: ebefd083-70a2-47c8-9837-e7b5634df524 id2: 1 id3: 1
04-20 17:10:57.015 24817-24865/com.mobinteg.ibeacon D/BeaconService﹕ beacon detected : id1: ebefd083-70a2-47c8-9837-e7b5634df524 id2: 1 id3: 1
04-20 17:10:57.015 24817-24865/com.mobinteg.ibeacon D/Callback﹕ attempting callback via intent: ComponentInfo{com.mobinteg.ibeacon/org.altbeacon.beacon.BeaconIntentProcessor}
04-20 17:10:57.025 24817-24865/com.mobinteg.ibeacon D/BeaconService﹕ looking for ranging region matches for this beacon
04-20 17:10:57.035 24817-25231/com.mobinteg.ibeacon D/BeaconIntentProcessor﹕ got an intent to process
04-20 17:10:57.035 24817-25231/com.mobinteg.ibeacon D/BeaconIntentProcessor﹕ got monitoring data
04-20 17:10:57.045 24817-25231/com.mobinteg.ibeacon D/BeaconIntentProcessor﹕ Calling monitoring notifier: com.mobinteg.ibeacon.Background@420719f8
04-20 17:10:57.045 24817-25231/com.mobinteg.ibeacon D/testbackground﹕ Region id1: null id2: null id3: null
04-20 17:10:57.045 24817-25231/com.mobinteg.ibeacon D/testbackground﹕ Got a didEnterRegion call
04-20 17:10:57.285 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Waiting to stop scan cycle for another 63 milliseconds
04-20 17:10:57.285 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{42293608: android.os.BinderProxy@42293598}
04-20 17:10:57.295 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{422a1e20: android.os.BinderProxy@422a1db0}
04-20 17:10:57.355 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Done with scan cycle
04-20 17:10:57.355 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ stopping bluetooth le scan
04-20 17:10:57.355 24817-24817/com.mobinteg.ibeacon D/BluetoothAdapter﹕ stopLeScan()
代码如下
public class Background extends Application implements BootstrapNotifier{
private static final String TAG = "testbackground";//".MyApplicationName";
private static final String UUID = "EBEFD08370A247C89837E7B5634DF524";//"ebefd083-70a2-47c8-9837-e7b5634df524";//
//private BackgroundPowerSaver backgroundPowerSaver;//to able battery saving
private RegionBootstrap regionBootstrap;
private BeaconManager beaconManager;
@Override
public void onCreate() {
super.onCreate();
beaconManager.setDebug(true);
// Simply constructing this class and holding a reference to it in your custom Application class
// enables auto battery saving of about 60%
//backgroundPowerSaver = new BackgroundPowerSaver(this);
Region region = new Region(".Background",null,null,null);
beaconManager = BeaconManager.getInstanceForApplication(this);
beaconManager.getBeaconParsers().add(new BeaconParser()
.setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"));
try{
// set the duration of the scan to be 1.1 seconds
beaconManager.setBackgroundScanPeriod(1100l);
// set the time between each scan to be 1 hour (3600 seconds)//50000l
beaconManager.setBackgroundBetweenScanPeriod(15000l);//3600000l
beaconManager.updateScanPeriods();
//beaconManager.startMonitoringBeaconsInRegion(region);
} catch (RemoteException e) {
//Log.e(TAG, "Cannot talk to service");
}
// wake up the app when any beacon is seen (you can specify specific id filers in the parameters below)
regionBootstrap = new RegionBootstrap(Background.this, region);
}
@Override
public void didDetermineStateForRegion(int state, Region region) {
// Don't care
Log.d(TAG, "Region " + region.toString());
}
@Override
public void didEnterRegion(Region arg0) {
Log.d(TAG, "Got a didEnterRegion call");
// This call to disable will make it so the activity below only gets launched the first time a beacon is seen (until the next time the app is launched)
// if you want the Activity to launch every single time beacons come into view, remove this call.
//regionBootstrap.disable();
Intent intent = new Intent(this, MainActivity.class);
// IMPORTANT: in the AndroidManifest.xml definition of this activity, you must set android:launchMode="singleInstance" or you will get two instances
// created when a user launches the activity manually and it gets launched from here.
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//beaconManager.setBackgroundMode(false);
this.startActivity(intent);
}
@Override
public void didExitRegion(Region arg0) {
// Don't care
}
}
两个日志摘录都显示正常操作。在第一种情况下，当设备已经在信标区域内时（例如，信标已经可见），就会检测到信标。因此不会调用 didEnterRegion 回调。
在第二种情况下，当设备不在信标区域内时（例如，当前没有可见的信标），就会检测到信标。 didEnterRegion 回调因此被调用。
为了让您获得对 didEnterRegion 方法的第二次回调，您必须等待足够长的时间让设备检测到周围没有信标。根据每 15 秒扫描 1.1 秒的后台设置，这可能需要 21.1 秒才能发生（15 秒 + 1.1 秒 + 5 秒消失）。因此，您必须关闭信标超过 20 秒（或暂时将 Android 设备远离所有信标），然后才能再次调用 didEnterRegion.
在后台使用 altbeacon 库，它仅在某些时候检测到信标，或者至少仅在某些时候将应用程序触发到前台。 以下是未检测到和检测良好时的日志。
04-20 17:10:07.335 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{422554f0: android.os.BinderProxy@42255480}
04-20 17:10:07.365 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{42256498: android.os.BinderProxy@42256428}
04-20 17:10:07.925 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ starting a new scan cycle
04-20 17:10:07.925 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ starting a new bluetooth le scan
04-20 17:10:07.925 24817-24817/com.mobinteg.ibeacon D/BluetoothAdapter﹕ startLeScan(): null
04-20 17:10:07.945 24817-24833/com.mobinteg.ibeacon D/BluetoothAdapter﹕ onClientRegistered() - status=0 clientIf=5
04-20 17:10:07.955 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Waiting to stop scan cycle for another 1100 milliseconds
04-20 17:10:07.965 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{42256498: android.os.BinderProxy@42256428}
04-20 17:10:07.985 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{422577d0: android.os.BinderProxy@42257760}
04-20 17:10:07.985 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Scan started
04-20 17:10:08.765 24817-24832/com.mobinteg.ibeacon D/BluetoothAdapter﹕ onScanResult() - Device=D6:06:36:3A:71:B3 RSSI=-63
04-20 17:10:08.765 24817-24832/com.mobinteg.ibeacon D/CycledLeScannerForJellyBeanMr2﹕ got record
04-20 17:10:08.765 24817-25200/com.mobinteg.ibeacon D/BeaconParser﹕ This is not a matching Beacon advertisement. (Was expecting be ac. The bytes I see are: 0201041bff4c000215ebefd08370a247c89837e7b5634df52400010001cb5f00000000000000000000000000000000000000000000000000000000000000
04-20 17:10:08.765 24817-25200/com.mobinteg.ibeacon D/BeaconParser﹕ This is a recognized beacon advertisement -- 02 15 seen
04-20 17:10:08.765 24817-25200/com.mobinteg.ibeacon D/BeaconService﹕ beacon detected multiple times in scan cycle : id1: ebefd083-70a2-47c8-9837-e7b5634df524 id2: 1 id3: 1
04-20 17:10:08.765 24817-25200/com.mobinteg.ibeacon D/BeaconService﹕ beacon detected : id1: ebefd083-70a2-47c8-9837-e7b5634df524 id2: 1 id3: 1
04-20 17:10:08.775 24817-25200/com.mobinteg.ibeacon D/BeaconService﹕ looking for ranging region matches for this beacon
04-20 17:10:08.985 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Waiting to stop scan cycle for another 71 milliseconds
04-20 17:10:08.985 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{422577d0: android.os.BinderProxy@42257760}
04-20 17:10:08.995 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{4225b930: android.os.BinderProxy@4225b8c0}
04-20 17:10:09.065 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Done with scan cycle
04-20 17:10:09.065 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ stopping bluetooth le scan
04-20 17:10:09.075 24817-24817/com.mobinteg.ibeacon D/BluetoothAdapter﹕ stopLeScan()
04-20 17:10:09.085 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Normalizing between scan period from 15000 to 14915
04-20 17:10:09.085 24817-24817/com.mobinteg.ibeacon D/CycledLeScannerForJellyBeanMr2﹕ Waiting to start next bluetooth scan for another 14915 milliseconds
当它发射良好时，它显示为：
04-20 17:10:56.225 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ starting a new scan cycle
04-20 17:10:56.225 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ starting a new bluetooth le scan
04-20 17:10:56.225 24817-24817/com.mobinteg.ibeacon D/BluetoothAdapter﹕ startLeScan(): null
04-20 17:10:56.235 24817-24833/com.mobinteg.ibeacon D/BluetoothAdapter﹕ onClientRegistered() - status=0 clientIf=5
04-20 17:10:56.245 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Waiting to stop scan cycle for another 1100 milliseconds
04-20 17:10:56.245 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{422922d0: android.os.BinderProxy@42292260}
04-20 17:10:56.285 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{42293608: android.os.BinderProxy@42293598}
04-20 17:10:56.285 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Scan started
04-20 17:10:56.995 24817-24832/com.mobinteg.ibeacon D/BluetoothAdapter﹕ onScanResult() - Device=D6:06:36:3A:71:B3 RSSI=-68
04-20 17:10:56.995 24817-24832/com.mobinteg.ibeacon D/CycledLeScannerForJellyBeanMr2﹕ got record
04-20 17:10:56.995 24817-24865/com.mobinteg.ibeacon D/BeaconParser﹕ This is not a matching Beacon advertisement. (Was expecting be ac. The bytes I see are: 0201041bff4c000215ebefd08370a247c89837e7b5634df52400010001cb6100000000000000000000000000000000000000000000000000000000000000
04-20 17:10:57.005 24817-24865/com.mobinteg.ibeacon D/BeaconParser﹕ This is a recognized beacon advertisement -- 02 15 seen
04-20 17:10:57.005 24817-24865/com.mobinteg.ibeacon D/BeaconService﹕ beacon detected multiple times in scan cycle : id1: ebefd083-70a2-47c8-9837-e7b5634df524 id2: 1 id3: 1
04-20 17:10:57.015 24817-24865/com.mobinteg.ibeacon D/BeaconService﹕ beacon detected : id1: ebefd083-70a2-47c8-9837-e7b5634df524 id2: 1 id3: 1
04-20 17:10:57.015 24817-24865/com.mobinteg.ibeacon D/Callback﹕ attempting callback via intent: ComponentInfo{com.mobinteg.ibeacon/org.altbeacon.beacon.BeaconIntentProcessor}
04-20 17:10:57.025 24817-24865/com.mobinteg.ibeacon D/BeaconService﹕ looking for ranging region matches for this beacon
04-20 17:10:57.035 24817-25231/com.mobinteg.ibeacon D/BeaconIntentProcessor﹕ got an intent to process
04-20 17:10:57.035 24817-25231/com.mobinteg.ibeacon D/BeaconIntentProcessor﹕ got monitoring data
04-20 17:10:57.045 24817-25231/com.mobinteg.ibeacon D/BeaconIntentProcessor﹕ Calling monitoring notifier: com.mobinteg.ibeacon.Background@420719f8
04-20 17:10:57.045 24817-25231/com.mobinteg.ibeacon D/testbackground﹕ Region id1: null id2: null id3: null
04-20 17:10:57.045 24817-25231/com.mobinteg.ibeacon D/testbackground﹕ Got a didEnterRegion call
04-20 17:10:57.285 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Waiting to stop scan cycle for another 63 milliseconds
04-20 17:10:57.285 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ cancel wakeup alarm: PendingIntent{42293608: android.os.BinderProxy@42293598}
04-20 17:10:57.295 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Set a wakeup alarm to go off in 300000 ms: PendingIntent{422a1e20: android.os.BinderProxy@422a1db0}
04-20 17:10:57.355 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ Done with scan cycle
04-20 17:10:57.355 24817-24817/com.mobinteg.ibeacon D/CycledLeScanner﹕ stopping bluetooth le scan
04-20 17:10:57.355 24817-24817/com.mobinteg.ibeacon D/BluetoothAdapter﹕ stopLeScan()
代码如下
public class Background extends Application implements BootstrapNotifier{
private static final String TAG = "testbackground";//".MyApplicationName";
private static final String UUID = "EBEFD08370A247C89837E7B5634DF524";//"ebefd083-70a2-47c8-9837-e7b5634df524";//
//private BackgroundPowerSaver backgroundPowerSaver;//to able battery saving
private RegionBootstrap regionBootstrap;
private BeaconManager beaconManager;
@Override
public void onCreate() {
super.onCreate();
beaconManager.setDebug(true);
// Simply constructing this class and holding a reference to it in your custom Application class
// enables auto battery saving of about 60%
//backgroundPowerSaver = new BackgroundPowerSaver(this);
Region region = new Region(".Background",null,null,null);
beaconManager = BeaconManager.getInstanceForApplication(this);
beaconManager.getBeaconParsers().add(new BeaconParser()
.setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24,d:25-25"));
try{
// set the duration of the scan to be 1.1 seconds
beaconManager.setBackgroundScanPeriod(1100l);
// set the time between each scan to be 1 hour (3600 seconds)//50000l
beaconManager.setBackgroundBetweenScanPeriod(15000l);//3600000l
beaconManager.updateScanPeriods();
//beaconManager.startMonitoringBeaconsInRegion(region);
} catch (RemoteException e) {
//Log.e(TAG, "Cannot talk to service");
}
// wake up the app when any beacon is seen (you can specify specific id filers in the parameters below)
regionBootstrap = new RegionBootstrap(Background.this, region);
}
@Override
public void didDetermineStateForRegion(int state, Region region) {
// Don't care
Log.d(TAG, "Region " + region.toString());
}
@Override
public void didEnterRegion(Region arg0) {
Log.d(TAG, "Got a didEnterRegion call");
// This call to disable will make it so the activity below only gets launched the first time a beacon is seen (until the next time the app is launched)
// if you want the Activity to launch every single time beacons come into view, remove this call.
//regionBootstrap.disable();
Intent intent = new Intent(this, MainActivity.class);
// IMPORTANT: in the AndroidManifest.xml definition of this activity, you must set android:launchMode="singleInstance" or you will get two instances
// created when a user launches the activity manually and it gets launched from here.
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//beaconManager.setBackgroundMode(false);
this.startActivity(intent);
}
@Override
public void didExitRegion(Region arg0) {
// Don't care
}
}
两个日志摘录都显示正常操作。在第一种情况下，当设备已经在信标区域内时（例如，信标已经可见），就会检测到信标。因此不会调用 didEnterRegion 回调。
在第二种情况下，当设备不在信标区域内时（例如，当前没有可见的信标），就会检测到信标。 didEnterRegion 回调因此被调用。
为了让您获得对 didEnterRegion 方法的第二次回调，您必须等待足够长的时间让设备检测到周围没有信标。根据每 15 秒扫描 1.1 秒的后台设置，这可能需要 21.1 秒才能发生（15 秒 + 1.1 秒 + 5 秒消失）。因此，您必须关闭信标超过 20 秒（或暂时将 Android 设备远离所有信标），然后才能再次调用 didEnterRegion.